Brake Fluid Pressure Sensor Inspection

Turn the ignition switch off.
Install the SSTs to the master cylinder as shown in the figure.
NOTE:
- When installing the SST (49 D043 0A0) to the master cylinder, use a commercially available flare nut wrench (flare nut across flat 12 mm {0.47 in}).
Bleed the brake line and the SSTs of air. (Bleed the SSTs of air using air bleed valve A.)

Fig 1: Installing SST To Master Cylinder
Courtesy of MAZDA MOTORS CORP.
Connect the M-MDS to the DLC-2.
Select the "MPRETDR" PID. (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)] .)
Start the engine.
Depress the brake pedal, and verify that the fluid pressure value of the SST (gauge) and the value shown on the M-MDS are equal.
- If the fluid pressure values are different, replace the DSC HU/CM. (See DSC HU/CM REMOVAL/INSTALLATION ).
  
  Fig 2: Identifying DLC-2 Connector
  Courtesy of MAZDA MOTORS CORP.